Pneumatic signal-bell.



11 Nrrun era res PATENT FFICE.

PNEUMATIC SIGNAL-BELL.

Specification of Letters Patent.

Patented Dec. 26, 1905.

Application filed June 12, 1905- Serial No. 264,806.

To (tZZ whont it may concern:

Be it knownthat I, JOSEPH H. BRADY, a citizen of the United States, residing at Kansas City, in the county of Jackson and State of Missouri, have invented certain new and useful Improvements in Pneumatic Signal-Bells, of which the following is a specification.

My invention relates to improvements in pneumatic signal-bells, it being an improvement on the bell embodied in my pneumatic signal, No. 725,402, patented April 14, 1903.

The chief features of the present invention reside in the combination of a rotary motor, an expansible hammer, and a gong, whereby continuous sound is produced while the motor is in operation.

The invention further consists in the novel construction, combination, and arrangement of parts hereinafter described, and pointed out in the claims, and in order that it may be fully understood reference will now be made to the accompanying drawings, in which-- Figure 1 represents a perspective view of the invention. Fig. 2 is a vertical central section of same, taken on line 11 II of Fig. 4:. Fig. 3 is a cross-section taken on line III III of Fig. 4, showing the gong and the hammer forming part of the invention. Fig. 4. is a horizontal transverse section taken on line IV 'IV of Fig. 2.

In said drawings, 1 designates a cylinder provided at its upper portion with aninletport 2 and an exhaust-port 3, said ports being preferably arranged in horizontal alinement, as shown in Figs. 1 and 2.

at designates a supply-pipe communicating with the inlet-port for the purpose of conducting fluid under pressure to said inlet-port, the flow of the fluid through said pipe being controlled by means of a suitable valve. (Not shown.) The sides of the cylinder are inclosed by an integral head 5 and a removable head 6, which latter is held in position by screws 6. Head 5 has a centrally-disposed bearing '7, carrying a rigidly-mounted shaft 8, projecting through head 6 and provided at its reduced outer end 9 with threads 9, engaged by the internally-t1]readed boss 10 of gong 11. Head 6 is provided with a centrally-disposed bearing 12, in which a tubular shaft 13 is journaled, the inner end of said shaft being journaled in a socket 14 in hearing 7. The internal diameter of said shaft is slightly greater than the diameter of shaft 8, over which it fits, so that it will not contact therewith, and thus create friction while rotating.

15 designates a turbine-wheel provided with a series of pockets 16, formed by blades 17, disks 18, and the ring 19 of said wheel, which latter is also provided with spokes 20, radiating from a centrally-disposed hub 21, rigidly mounted upon the tubular shaft and arranged between bearings 7 and 12, which prevent lateral movement of said hub.

22 designates a hammer comprising an arm 23 and a pair of annular clappers 2 adapted to strike 2. lug 25, projecting from the interior surface of the gong into the path of said clappers, as shown in Figs. 3 and 4. The enlarged central portion of arm 23 is provided with a tubular boss 26, snugly fitting the outer terminal of shaft 13, upon which it is reliably secured by a set-screw 27. The clappers 24: are loosely mounted upon rivets 28, projecting from the terminals of arm 23, said clappers being retained upon the rivets by means of washers 29.

Cylinder-head 5 isprovided with two screwholes 30 for the reception of screw s,. (not shown,) whereby it may be secured to a wall or other object, although I do not wish it understood that I confine myself to this method of mounting the motor.

In practice fluid under pressure is conducted from a suitable source of supply by pipe A to the inlet-port 2, through which it discharges against blades 17, the latter being arranged at an angle, as shown in Fig. 2, in order to receive the full force of the fluid, so that when the latter impinges against the blades the turbine-wheel will be rotated thereby at a high rate of speed. As the tubular shaft and the hammer rotate with the turbine-wheel the clappers will be thrown outwardly by centrifugal force and at each revolution strike the lug 25 on the gong, making two strokes of the hammer at each revolution, and as said strokes follow each other in rapid succession the ringing of the gong will be continuous until the motive fluid is cut off from the cylinder.

Although I prefer to use compressed air as the motive fluid, steam or water would prove equally as effective, and when either is employed I provide the lower portion of the cylinder with an auxiliary exhaust-port 31 (shown by dotted lines, Fig. 2) for the escape of all entrained steam or water which does not pass outwardly through exhaust-port 3.

The invention is especially adaptable for use on electric or steam railway-cars, railwaycrossings, school-buildings, or wherever a signal of this character is required.

From the above description it is apparent that the parts may be readily assembled or taken apart should it become necessary to replace or repair them. ltis also apparent thatI have produced a signal-bell which is simple in construction and thoroughly adapted for the purposes intended, and while I have shown the preferred form of my invention 1 of course reserve the right to make such changes as properly fall within the spirit and scope of the appended claims.

Having thus described my invention, what 1 claim, and desire to secure by Letters Patent, is

1. A pneumatic signal-bell consisting of a rotary motor, a rigidly-mounted shaft having one end projecting laterally from the center of the motor-cylinder, a gong arranged concentrically with the motor-cylinder, a boss integral with said gong and secured to the projecting end of the shaft, a tubular shaft journaled upon the rigid shaft and carrying the turbine-wheel of the motor, said shaft also having one end projecting from the motorcylinder, an arm secured at its central portion to the projecting end of said tubular shaft, and clappers loosely secured to the terminals of said arm so they will be thrown into contact with the gong by centrifugal force.

2. A pneumatic signal-bell comprising a rotary motor provided with a turbine-wheel having pockets for the reception of the motive fluid, a rigidly-mounted shaft having a threaded end projecting laterally from the center of the motor-cylinder, a shoulder on said projecting end, a gong arranged concentrically with the motor-shaft and provided with an internal lug, a boss integral with said gong and provided with internal threads for engagement with the threads on the shaft, a tubular shaft journaled upon the rigid shaft and carrying the turbine-wheel of the motor, said shaft also having one end projecting from the cylinder, an arm having an enlarged central portion, a tubular boss integral with said central portion and fitting snugly over the projecting end of the tubular shaft, and clappers loosely secured to the terminals of said arms so they will be thrown into contact with the lug by centrifugal force, substantially as shown and described.

In testimony whereof I afiix my signature in the presence of two witnesses.

JOSEPH H. BRADY.

\Vitnesses:

F. G. FISCHER, J. Moons. 

